New Holland 24 – TRANS: Transmission Clutches Not Calibrated

The fault code indicates that none of the transmission clutches are calibrated. The Transmission Control Unit (TCU) lacks the necessary data on the clutch engagement points, which can lead to harsh or delayed shifts and affect the proper operation of the transmission system. This typically occurs when a new controller is installed or if the non-volatile memory has been reset.

• T Series
• T4
• T5
• T7
• T8
• Genesis 70 Series
• 8670
• G170
• TM Series
• TM115
• TM190
• TS Series
• TS-A Series
• TL Series
• TL-A Series
• M Series
• 60 Series
• 8560
• T7030
• T9050

1. 1

   Check transmission oil temperature via the diagnostic menu (Mode HA) to ensure it is within the required range for your transmission type (Full Powershift: 60°C–105°C, Semi-Powershift: 20°C–50°C, Range Command: 10°C–60°C).

2. 2

   Ensure the tractor is parked on level ground with the parking brake engaged.

3. 3

   Verify all levers are in neutral and the engine is stopped before initiating calibration mode. No wheel movement should be detected.

4. 4

   Ensure the operator remains in the seat during the entire process to prevent interruption.

1. 1

   Perform General Manual Calibration Procedure (e.g., TM & 60 Series with Range Command)

   1. Engage handbrake. 2. Press and hold upshift and downshift buttons while starting tractor. 3. Set engine speed to ~1200 RPM (+/- 50 RPM). 4. Place shuttle lever in FORWARD. 5. Press upshift to select clutch 'A'. 6. Hold downshift to calibrate 'A' until RPM decreases and display alternates clutch letter and number. 7. Release downshift ('b' displayed). 8. Repeat for clutches B, C, D, E, F. 9. 'CF' appears when complete. 10. Turn key OFF to store values.

2. 2

   Perform Automatic Calibration Procedure (e.g., T7 Series)

   1. With handbrake on and shuttle in neutral, hold clutch pedal. 2. Hold upshift and downshift buttons, start engine, release buttons. 3. Release clutch pedal. 4. Press upshift twice ('CL' displayed). 5. Press upshift again ('Dt' displayed). 6. Depress clutch, move shuttle forward, release clutch. 7. Press automatic function switch (engine goes to 1200 RPM, auto calibration begins). 8. 'End' appears when complete. 9. Turn engine off and wait at least 10 seconds.

3. 3

   Perform Genesis 70 Series Calibration

   1. Place shift lever in neutral. 2. Hold shifter left while turning key on. Release when dash lights up ('CC' appears). 3. Start tractor. 4. Adjust to 1200 RPM at operating temp. 5. Push shifting lever forward ('CC' flashes, calibration proceeds automatically). 6. Turn key off and wait 10 seconds before restarting.

4. 4

   Inspect transmission solenoids

   If the calibration procedure repeatedly fails or the fault persists, inspect and potentially replace the 12V electro-hydraulic transmission solenoid valves that control fluid flow to the clutch packs. A failing solenoid can prevent clutch engagement.